Spoiling of transverse magnetization in steady-state sequences Export

@article{rfspoiling2, abstract = {A detailed analysis is presented of a method to eliminate transverse magnetization prior to each rf excitation in pulse sequences with TR \< T2. It is shown that artifact-free images with high T1 contrast can be obtained only if a phase shift that is incremented during each TR interval is applied to the transverse magnetization. Computer simulations are used to show that when this phase increment is 117°, the steady-state transverse magnetization prior to each rf pulse is nulled over a wide range of T1, T2, and rf tip angles, resulting in optimal T1, contrast. Such nulling of steady-state transverse magnetization cannot be obtained by using large gradient pulses, or gradients of random or linearly incremented amplitude. Images of phantoms and human subjects confirm the theoretical predictions. {\copyright} 1991 Academic Press, Inc.}, address = {Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; Department of Radiation Oncology, New England Medical Center and Tufts University, Boston, Massachusetts 02111}, author = {Zur, Y. and Wood, M. L. and Neuringer, L. J.}, citeulike-article-id = {3208418}, citeulike-linkout-0 = {http://dx.doi.org/10.1002/mrm.1910210210}, citeulike-linkout-1 = {http://www3.interscience.wiley.com/cgi-bin/abstract/112149751/ABSTRACT}, comment = {sie regen im steady state die magnetisierung jedes mal mit einem kleinen ver\"{a}ndertem winkel gegen x an.}, doi = {10.1002/mrm.1910210210}, journal = {Magnetic Resonance in Medicine}, keywords = {1991, mrm, rf-spoiling}, number = {2}, pages = {251--263}, posted-at = {2008-09-09 10:13:09}, priority = {4}, title = {Spoiling of transverse magnetization in steady-state sequences}, url = {http://dx.doi.org/10.1002/mrm.1910210210}, volume = {21}, year = {1991} }

TY - JOUR ID - rfspoiling2 L3 - citeulike-article-id:3208418 N2 - A detailed analysis is presented of a method to eliminate transverse magnetization prior to each rf excitation in pulse sequences with TR < T2. It is shown that artifact-free images with high T1 contrast can be obtained only if a phase shift that is incremented during each TR interval is applied to the transverse magnetization. Computer simulations are used to show that when this phase increment is 117°, the steady-state transverse magnetization prior to each rf pulse is nulled over a wide range of T1, T2, and rf tip angles, resulting in optimal T1, contrast. Such nulling of steady-state transverse magnetization cannot be obtained by using large gradient pulses, or gradients of random or linearly incremented amplitude. Images of phantoms and human subjects confirm the theoretical predictions. © 1991 Academic Press, Inc. IS - 2 JF - Magnetic Resonance in Medicine AD - Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139; Department of Radiation Oncology, New England Medical Center and Tufts University, Boston, Massachusetts 02111 EP - 263 TI - Spoiling of transverse magnetization in steady-state sequences VL - 21 SP - 251 KW - 1991 KW - mrm KW - rf-spoiling N1 - sie regen im steady state die magnetisierung jedes mal mit einem kleinen verändertem winkel gegen x an. AU - Zur, Y AU - Wood, ML AU - Neuringer, LJ PY - 1991/// UR - http://dx.doi.org/10.1002/mrm.1910210210 ER -